On Tue, 2021-02-23 at 16:27 +0100, Johannes Berg wrote: > In order to simulate some devices and write tests completely > independent of real PCI devices, we continued the development > of time-travel and related bits, and are adding PCI support > here now. > > The way it works is that it communicates with the outside (of > UML) with virtio, which we previously added using vhost-user, > and then offers a PCI bus to the inside system, where normal > PCI probing etc. happens, but all config space & IO accesses > are forwarded over virtio.
I hadn't sent it out until now, but the userspace bits for all the time- travel and PCI-over-vhost-user are here: https://github.com/linux-test-project/usfstl/ If anyone has any suggestions on a good example PCI device that already has a driver upstream I'd be interested - I looked for something simple like LED or GPIO but no such thing I could find (that wasn't platform dependent in some way). So far I've only implemented a virtual Intel WiFi NIC, but that depends on a large body of code I can't publish. As an example, it would be nice to write (and publish there) a simple PCI device implementation. :) johannes
